import { javaCompatibleBase64Decode} from "@/utils/base64Utils.js"
// 定义 CCITT 表
const CCITT_TABLE = [
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
    0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
    0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
    0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
    0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
    0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
    0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
    0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
    0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
    0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
    0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
    0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
    0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
    0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
    0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
    0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
    0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
    0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
    0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
    0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
    0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
    0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
    0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
    0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
    0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
    0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
    0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
    0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
];

// 计算 CRC CCITT
export function crcCcitt(data, crc) {
    const length = data.length;
    for (let i = 0; i < length; i++) {
        const index = ((crc >> 8) ^ (data[i] & 0xff)) & 0xff;
        crc = (CCITT_TABLE[index] ^ (crc << 8)) & 0xffff;
    }
    return ~crc & 0xffff;
}
/**
 * 将Uint8Array转换为字符串（兼容所有环境）
 * @param {Uint8Array} bytes - 字节数组
 * @returns {string} - 解码后的字符串
 */
export function bytesToString(bytes) {
  // 优先使用TextDecoder（现代环境）
  if (typeof TextDecoder !== 'undefined') {
    return new TextDecoder().decode(bytes);
  }
  
  // 兼容旧环境的方法
  let result = '';
  for (let i = 0; i < bytes.length; i++) {
    result += String.fromCharCode(bytes[i]);
  }
  
  // 处理UTF-8编码的多字节字符
  return decodeURIComponent(escape(result));
}
/**
 * 将字符串转换为UTF-8字节数组（等效于Java的str.getBytes()）
 * @param {string} str - 输入字符串
 * @returns {Uint8Array} - UTF-8编码的字节数组
 */
export function stringToUtf8Bytes(str) {
  // 方案1：使用TextEncoder（现代浏览器和App环境支持）
  if (typeof TextEncoder !== 'undefined') {
    return new TextEncoder().encode(str);
  }
  
  // 方案2：兼容旧环境的手动UTF-8编码
  const bytes = [];
  for (let i = 0; i < str.length; i++) {
    const charCode = str.charCodeAt(i);
    
    if (charCode < 0x80) {
      // ASCII字符（0-127）
      bytes.push(charCode);
    } else if (charCode < 0x800) {
      // 2字节UTF-8字符
      bytes.push(0xc0 | (charCode >> 6));
      bytes.push(0x80 | (charCode & 0x3f));
    } else if (charCode < 0x10000) {
      // 3字节UTF-8字符（基本多语言平面）
      bytes.push(0xe0 | (charCode >> 12));
      bytes.push(0x80 | ((charCode >> 6) & 0x3f));
      bytes.push(0x80 | (charCode & 0x3f));
    } else if (charCode < 0x110000) {
      // 4字节UTF-8字符（辅助平面）
      bytes.push(0xf0 | (charCode >> 18));
      bytes.push(0x80 | ((charCode >> 12) & 0x3f));
      bytes.push(0x80 | ((charCode >> 6) & 0x3f));
      bytes.push(0x80 | (charCode & 0x3f));
    }
  }
  
  return new Uint8Array(bytes);
}

/**
 * 将Java的有符号字节数组转换为JavaScript的Uint8Array
 * @param {Array<number>} javaBytes - Java的byte[]数组（有符号）
 * @returns {Uint8Array} - JavaScript的无符号字节数组
 */
export function javaBytesToUint8Array(javaBytes) {
  return new Uint8Array(javaBytes.map(byte => byte < 0 ? byte + 256 : byte));
}

/**
 * 将JavaScript的Uint8Array转换为Java的有符号字节数组
 * @param {Uint8Array} uint8Array - JavaScript的无符号字节数组
 * @returns {Array<number>} - Java风格的有符号字节数组
 */
export function uint8ArrayToJavaBytes(uint8Array) {
  return Array.from(uint8Array).map(byte => byte > 127 ? byte - 256 : byte);
}
// 将字符串转换为字节数组
export function stringToByteArray(str) {
	return stringToUtf8Bytes(str);
    // const bytes = [];
    // const escapedStr = unescape(encodeURIComponent(str));
    // for (let i = 0; i < escapedStr.length; i++) {
    //     bytes.push(escapedStr.charCodeAt(i));
    // }
    // return new Uint8Array(bytes);
}

// 从 JSON 构建数据包
export function buildPacketFromJson(outstr, checksum) {
    const data = stringToByteArray(outstr);
    const dataSize = data.length;
    const packet = new Uint8Array(10 + dataSize);
    packet[0] = 0x7E;
    packet[1] = 0xE7;
    // 写入数据大小
    packet[2] = (dataSize >> 24) & 0xff;
    packet[3] = (dataSize >> 16) & 0xff;
    packet[4] = (dataSize >> 8) & 0xff;
    packet[5] = dataSize & 0xff;
    // 写入校验和
    packet[6] = (checksum >> 8) & 0xff;
    packet[7] = checksum & 0xff;
    const header = packet.slice(0, 8);
    const headerCrc = crcCcitt(header, 0);
    // 写入头部 CRC
    packet[8] = (headerCrc >> 8) & 0xff;
    packet[9] = headerCrc & 0xff;
    // 写入数据
    packet.set(data, 10);
    return packet;
}

// 缓冲区转换为 JSON
export function bufferToJson(pBuffer, nStart, nOffset) {
    const jdata = [];

    for (let i = nStart; i < nOffset; i++) {
				// console.log(pBuffer[i] )
        if (pBuffer[i] === 0x7E) {
            if (i + 1 < nOffset && pBuffer[i + 1] === 0xE7) {
                if (nOffset > i + 8) {
                    const crc0 = crcCcitt(pBuffer.slice(i, i + 8), 0);
                    const crc1 = ((pBuffer[i + 8] & 0xff) << 8) | (pBuffer[i + 9] & 0xff);
                    if (crc0 === crc1) {
                        const nPacketSize = ((pBuffer[i + 2] & 0xff) << 24) | ((pBuffer[i + 3] & 0xff) << 16) |
                            ((pBuffer[i + 4] & 0xff) << 8) | (pBuffer[i + 5] & 0xff);
                        if (i + 10 + nPacketSize <= nOffset) {
                            const dataCrc = crcCcitt(pBuffer.slice(i + 10, i + 10 + nPacketSize), 0);
                            const packetCrc = ((pBuffer[i + 6] & 0xff) << 8) | (pBuffer[i + 7] & 0xff);
                         
							if (dataCrc === packetCrc) {
                                try {
								
                                    const jsonStr = decodeURIComponent(escape(String.fromCharCode.apply(null, pBuffer.slice(i + 10, i + 10 + nPacketSize))));
                                    // console.log(jsonStr)
									jdata.push(JSON.parse(jsonStr));
                                    nStart = i + 10 + nPacketSize;
                                    break;
                                } catch (e) {
                                    console.log("JSON decode error: " + e.message);
                                }
                            }
                        } else {
                            nStart = i;
                            break;
                        }
                    }
                } else {
                    nStart = i;
                    break;
                }
            } else {
                nStart = i;
                break;
            }
        }
    }
    return [nStart, nOffset,jdata];
}
/**
 * 从TCP流中解析JSON数据包（改进版）
 * @param {Uint8Array} buffer - 输入缓冲区
 * @param {number} [start=0] - 开始解析的位置
 * @returns {{processed: number, packets: any[]}} - 处理的字节数和解析出的数据包
 */
/**
 * 改进的JSON解析器，支持从TCP流中提取完整的JSON对象
 * @param {Uint8Array} buffer - 输入缓冲区
 * @param {number} [start=0] - 开始解析的位置
 * @returns {{processed: number, packets: any[], remainingBracket: number}}
 */
export function parseJsonPackets(buffer, start = 0) {
  const packets = [];
  let processed = 0;
  let currentPos = start;
  let bracketCount = 0;
  let inString = false;
  let escapeChar = false;
  let jsonStart = -1;
  
  // 处理空缓冲区
  if (!buffer || buffer.length === 0) {
    return { processed: 0, packets: [], remainingBracket: 0 };
  }
  
  // 遍历缓冲区查找JSON包
  for (let i = currentPos; i < buffer.length; i++) {
    const byte = buffer[i];
    
    // 处理字符串中的字符
    if (inString) {
      if (escapeChar) {
        escapeChar = false;
      } else if (byte === 34) { // "
        inString = false;
      } else if (byte === 92) { // \
        escapeChar = true;
      }
      continue;
    }
    
    // 处理非字符串中的字符
    if (byte === 34) { // "
      inString = true;
    } else if (byte === 123) { // {
      if (bracketCount === 0) {
        jsonStart = i; // 记录JSON开始位置
      }
      bracketCount++;
    } else if (byte === 125) { // }
      bracketCount--;
      
      // 找到完整的JSON对象
      if (bracketCount === 0 && jsonStart !== -1) {
        try {
          // 提取JSON字符串（使用兼容方法）
          const jsonStr = bytesToString(buffer.slice(jsonStart, i + 1));
          const jsonObj = JSON.parse(jsonStr);
          packets.push(jsonObj);
          
          // 更新处理位置
          currentPos = i + 1;
          processed = currentPos - start;
          
          // 重置状态，继续寻找下一个JSON
          jsonStart = -1;
        } catch (e) {
          console.error("JSON解析错误:", e);
          // 尝试继续解析，跳过当前可能损坏的JSON
          jsonStart = -1;
        }
      }
    }
  }
  
  // 返回处理结果和剩余括号计数（用于判断JSON是否完整）
  return { 
    processed, 
    packets, 
    remainingBracket: bracketCount 
  };
}

/**
 * 从套接字获取 JSON 数据包（改进版）
 * @param {Uint8Array} dataBuffer - 当前数据缓冲区
 * @param {Uint8Array} newData - 新接收的数据
 * @returns {{remainingBuffer: Uint8Array, packets: any[], isComplete: boolean}}
 */
export function getJsonPackets(dataBuffer, newData) {
  // 合并新数据到缓冲区
  const combinedBuffer = new Uint8Array(dataBuffer.length + newData.length);
  combinedBuffer.set(dataBuffer);
  combinedBuffer.set(newData, dataBuffer.length);
  
  // 解析JSON数据包
  const result = parseJsonPackets(combinedBuffer);
  
  // 创建剩余缓冲区（未处理的数据）
  const remainingBuffer = combinedBuffer.slice(result.processed);
  
  // 判断是否有未完成的JSON（括号未闭合）
  const isComplete = result.remainingBracket === 0;
  
  return {
    remainingBuffer,
    packets: result.packets,
    isComplete
  };
}


// 从套接字获取 JSON 数据包
export function getAJsonPacketFromSocket(nBytes, buffSize) {
    let pBuffer = new Uint8Array(0);
    let nOffset = 0;
    let nStart = 0;
    const MAX_BUFFER_SIZE = 65536;
    const jlist = [];

    while (true) {
        if (nOffset + buffSize > MAX_BUFFER_SIZE) {
            pBuffer = pBuffer.slice(nStart);
            nOffset = pBuffer.length;
            nStart = 0;
        }
        try {
            if (!nBytes || nBytes.length === 0) {
                break;
            }
            const newBuffer = new Uint8Array(pBuffer.length + nBytes.length);
            newBuffer.set(pBuffer, 0);
            newBuffer.set(nBytes, pBuffer.length);
            pBuffer = newBuffer;
            nOffset += nBytes.length;
        } catch (e) {
            console.log("Socket receive error: " + e.message);
            break;
        }
        const res = bufferToJson(pBuffer, nStart, nOffset);
        nStart = res[0];
        nOffset = res[1];
        if (res[2]) {
            jlist.push(res[2]);
        }
        if (jlist.length > 0) {
            return jlist;
        }
    }
    return jlist;
}
export function encodeBase64String(base64Str){
	// console.log("encodeBase64String")
	var nBytes=  javaCompatibleBase64Decode(base64Str);
	// console.log(nBytes)
	var	str= getAJsonPacketFromSocket(nBytes, 1024)
	// console.log(str)
	return str
}
export function jsonObjToByteArray(jsonObj){
	// console.log(typeof jsonObj)
    var jsonstr="{}"
	if(typeof jsonObj =="object"){
		jsonstr =JSON.stringify(jsonObj)
	}else{
		jsonstr=jsonObj
	}

	var bytes =stringToByteArray(jsonstr)
	
	const checksum = crcCcitt(stringToByteArray(jsonstr), 0);
		
	const byteArray = buildPacketFromJson(jsonstr, checksum);
	

	return byteArray;
}
export function fmtData(jsonObj){
	// console.log(typeof jsonObj)
    var jsonstr="{}"
	if(typeof jsonObj =="object"){
		jsonstr =JSON.stringify(jsonObj)
	}else{
		jsonstr=jsonObj
	}

	var bytes =stringToByteArray(jsonstr)
	
	const checksum = crcCcitt(stringToByteArray(jsonstr), 0);
		
	const byteArray = buildPacketFromJson(jsonstr, checksum);
	
	const base64String = btoa(String.fromCharCode.apply(null, byteArray));
	return base64String
}
export default{getJsonPackets,fmtData}